You can rent, but I prefer my own. One its easier to find (I marked it with a bright yellow bandana so it would stand out in a sea of strollers), two, you might be thankful if when leaving the park your child is asleep and you have it, you have a long walk ahead and a huge crowd to get through (easier to keep track of child). The only thing-make sure its compact and lightweight, especially if you will be doing a lot of travel on the buses. You will have to collapse and lift a lot and if the bus is crowded, a big bulky stroller is no fun! We stayed at CR so buses werent really a huge issue.
alison